34... f3f4  35. e3f4  35... f7f5 Black is preparing g6-g5 or Kg7-h6-h5. 36. h2h4 Prophylaxis against g6-g5. 36... e4e3 This is a difficult move for me, as I'd be afraid of giving the d3-square to the king. The computer (and Gukesh) aren't so scared.